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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a90de405d999ec2c65e675c1d13552598854e14c3303eb70766da2123c9d4d' 
  AND token = '8YlvpvgZTerZ5RI7cyGy708fxudjbHEVChO01nlJNJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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