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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb0a82c97759796b544c11590ea7cc66520d45aae0115b4423d1d0869073c23' 
  AND token = 'Hh0qbtJ4R5s0zXn9AqVdWYzMIsXYGFdjfVgFEhc2DfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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