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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9dcce00ad79dd6473ef2268448e87704354188b5b5b3ce5779500c4aab6e46' 
  AND token = 'owoJt0J2RlQ6PKsQSXb4zgcat5w1P6j/PLwgEG5cGFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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