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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042a9b91c04198d5aa4749cc7bff9199134e0f5b9041995d35253c27e62e1e42' 
  AND token = 'T9a6lElmxrEo3b0N/PIxV/WLBovN88CZj/pOKcE1d0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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