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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628451ef256b2f17a837bc8208dc03abf4c2c541ff1c6dd2f8e761febd58c044' 
  AND token = 'NPqZ19gtgWxx0NUuaxZotR2Anzx2iickfZm8eWlwktY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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