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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5efae97d4b09da8777de7a022c038038bf413be2483a89a3473711a1574033' 
  AND token = '5PnKS06rgW5nsURGG0EE4njR6IG3TnBxD+3h8gbvIso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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