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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee9ce22225b9b4511dcadf9484affe4443890421b793413fb91ecf015000ae7' 
  AND token = '3Z8dG48u5ZT/+KDM3qaMpYaoCARah5geoIUIL3efQao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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