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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a947a61635965cb2600d7322d44c66c18cdf65669ffd26dc94a087a4709323' 
  AND token = '2GOFr1uPdtF7ae3K4OoAkh/VNLOdEHyjwqyEraZCoSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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