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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d419a9993deb0911cb677292c5d9e9a5979dadff41674bc145368bb22c2e39' 
  AND token = 'fMJnSlJYOKyo8/hwbREdhTGYhN7FyzNpbcSn1ISlALk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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