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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578cc863c5516e3538cca7fd63462d3e6352d40f68c218707921d8491c059c0e' 
  AND token = 'qTikFXi7w9bCWnehyPHvkwncZW3LmVGZeO0w2ms7Kts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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