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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e12c8b0fee5e0199bf65e83f07fe532f6489e94f2d6dd54825c51f43d2e574e' 
  AND token = 'Bj5Ad3Ze80M1LuB5VX09GBmVC6v9JLIFNBkZ2m77BQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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