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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb42eae74312f8c41a004b66f0650eeb6ce4ac697464ae99f8e9e46e1f34a0fe' 
  AND token = 'cSeQyu6aZVFkF7mHOPEbly2qOTxaBJCezoMOg3LEC+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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