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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bce418f8f3d77630de74aa84a3897d5b55a7906fa9f9d591c03efe91fa7d106' 
  AND token = '1Z6zp0FSPmnw4upckP7+wB8h564tCHtKAq9MIm6Mq18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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