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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f262971becaa8824a2f58d92125848d0eb7f3e12944fbde62964a121deb3a36d' 
  AND token = 'kdyHCMNVCb8BLxzo6FTTkgagpOPvL/QOF5H8x5cUTPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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