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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f91cbe2dc500bd95a56fb428f684aa1a08192eed8e98288e37c08768989a31' 
  AND token = '4cdNXBkRHIPGbVPcbxJSViLLZ5hZ7DcAvlpx/lyR5bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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