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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec27ae7c57f1dc4bce9d9464c4c0c74222f4df73d63be1cb70b5f08bcb84b24' 
  AND token = 'ImcA4UaZYN7mkjVvcGqoedSZjrN9g6EEEtIlgqePXeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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