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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbc33d2e690f519190ef0a1f75db16c649bd6cfa5dc29d427948df20e0a5a08' 
  AND token = 'NrGZ6k7Zj4Dzjh4zhylZ8uFMMdsth27MVZP2i+gi7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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