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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd56eec40661921bb8c18c65a84038b68195918830e8449d1ad48a69cc99abf0' 
  AND token = 'MCb/sf3WmsXagEryyk40pKJiG2rDBT22t/Np5+OaSWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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