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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa83f38c064b740f101fb57288af12ac7b8701759cd1fc01f0a7a7799fa983fa' 
  AND token = 'wzbkSRJtFhOzPsyDGawyI7rheTWlm4QDsFxY0gey+KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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