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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3b4fd0cd7ddcbf7d04b242a65d6aced032b56527aa1fee11a6886b70840c3e' 
  AND token = 'IfD6cNKuHQH1hu2H1Mm20bePzvB4b6miuDLHO9wkYyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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