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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454f9d54ebbabfec5e88465f86b30929b4a3d8a462a6410654950b7a1ba6636e' 
  AND token = 'k9QwTUmX11nxnSlF+PyLdXo3HH4s3XALfVuVrPy2Gvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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