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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4629f11f948c1a52da3e0b39a953c2c0ef7f99a6fea41e66d54e539ad9b466b' 
  AND token = 'YwiWszEg8L1Qiuq240h5GLLN2YBwf3vUDf1hwPlXxXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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