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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdff1dbd0a8716c579279765f5b8760cfca2dcc51f5a1e7b08f370f6ca04ea84' 
  AND token = 'jVLf4HdXHlClcYIMRmlRQ2KBp3LJDX2FQDUjrobY0/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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