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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909f27f94adb20027683c4e15fae21dc38f8b9c0ee439f59f3dc8188abb0d6a0' 
  AND token = '+zkkN5eIaito3jWUFxHU21QC4p5w0gYDiPDmu5lx+Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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