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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943b2e2b28e3cea6a6dcf64e3b186fffa8fa9e0792234983207f6d1bb7ab706a' 
  AND token = 'UTTUHr8gZCViCfnXjHBT+igFzGBP1l0Wj60V3PBPNWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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