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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55030a12fb7f97b613a5b8b3060d23c3e679222604af3ab06ee44a4d6c1eebb1' 
  AND token = 'Xfs7pbyzkhIY7KW1g/+onMsKkHEgKr7zDrCJvnpHdXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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