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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e18e78d7dbebca22302e103364f439463e47bc5870071bc70513ceda036ff4' 
  AND token = 'hZb3sM6OOmHgwd2lZFBeDGNh0xgwck5VOm2zikXQrhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}