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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f3bcd78baff831343794f814b09c370ab7a7483a65abc5ef2d083c9a674966' 
  AND token = '9FCdG6nx3ad71MqwXSYl/IteGdc9ZdzeYw9srSQT5Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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