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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db751ff34fe00a31235ca0c6670dcb165bd120b4cd77b5945e935c26b8f22d7e' 
  AND token = '8Nn+ly7McpMRYISOfSDZ63fhqCM6mp4lRqp5XTG+Rdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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