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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59730eff5ad3716abe3def560a9b84b2af4a7cc731acd30b82ed0ca8f5c5085b' 
  AND token = 'EHeMwcRWkfwQGnigSYYapieyN8qxg0qRGg9J8ENqmq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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