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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942fcf0b3d9380364a59efd315ee97a490a57483bcccf0c52bac69a911f39923' 
  AND token = 'cdHrf/72Z5ZZe3sIN5YAXumZL5+UMuDFRMWjUlca2io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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