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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fef4671786cf38999017ba37e5fddebc7262044cbbb4b4f16034cc4044be233' 
  AND token = '18ddklf9WgzBR0hFzi0eLhX8EySAexlce79rhxo4Wt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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