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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407b33c9332673c6b5139a8f283cdd2337445b161b26e8b8767f324cce524073' 
  AND token = 'Juy/r874ZtQtKFmUx/5oosRVrKCRIKh/u7IdYDK5YHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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