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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237a7755261e2e0cca2e328aecd114b9cba8ec8079b3733f5ecfcda3f10b50e2' 
  AND token = 'xcjJ3gwZVX5y3qA0FNsHrXIyjpELd9uIGAmmvqj+ZnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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