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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e9a31644f85568b6f6ea4ea32d61cdfa43aa863de3d4400de553e288a10638' 
  AND token = 'BlNf8A0qpzIw0/2wAv4QFAteC+1fyGyarRM+Rdst7DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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