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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254bbbed5d771607e163da090e267b9b3b7f63fd6241b464ef1010dbe6e9fc97' 
  AND token = 'wJUxZRCl6bSixGn0O3J9BwAgx7FH/xBXphtv4ZUcZds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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