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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d1f1ffe6f9df2318ec07adb9f8ef15b5b4f139fd9c813760562f201ecc1996' 
  AND token = 'r748jVkfYlXzSfBS2silguq9eAviNy7mXMEOGyZtL7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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