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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf3539011aa0960ada8888d03585a7331af20fea003403cb0812abf2ee410c2' 
  AND token = 'ZOF9Mpb4YEcu18zUbT9mtusRqM006v3TJtkV8aa49Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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