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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43bb4fc0c57f232dc1d1b355b212d6bbf32d8d2b5c9c94b9de1ebd3287cb84a' 
  AND token = 'q7F0ot0q3LCI5Kf4TvPWIs9saWQ2PRVmv7ZwmTA7w6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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