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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef44c472d3a1508ee4c1eec5378b8ba3ad3e24275c82a5493ebb2e82e84cb1bd' 
  AND token = 'WGlyUZZBKak0IC0ovB8uTIhu350SG5LOvjA7LvacFY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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