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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c148c33eafffc93f4123746a1df662f75a3b3ab098507f464c425441d7968e0' 
  AND token = 's2XNdEpCKY/7y4LgK3mGCOAkLPZLMc6RyARe85d+i28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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