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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b77f30df1eb906a5586eb0e53e90457e130ae2918b880a8822e462c62c8bad' 
  AND token = 'Y7f0TQM2E8sJ+Aa8x07AGzZh3+K9kXdni8qle7GTKyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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