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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23037cd946ff36d9dcc1142658eb20281af248717a9a27757fd0821699f3a92' 
  AND token = 'R4/69WlVF7jxC9W2U56Gji/8DtwJ+0gat1I/zQF6R/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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