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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cbb73b00d5eda67e0a54a550155237cf32ffa182350d6f540df46888a82767' 
  AND token = 'JhESg8EDHIxHEDHiGBgptY3q88E/vRTNGuG2jgV+T8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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