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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cddb6ed094c7aea8ba2ede04f9383a628e1f4d9a77c2a88b2a2a1f60d2f0f70' 
  AND token = 'l1RV8SBqAZTN6EugjdBV8+XHs2/fCLa2zyGKHEbFAJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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