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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315a17f44c7d38695fb7c4b19eb0411782b8c6e6df50c01882828f42f56aea1d' 
  AND token = 'zqPSeD3s3yyeXnlq9GUfNhxaMbKvTJZ52J2T4P/uLZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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