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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef93f7b5fad9e694e5f4c4ae5e4d20ab10c0df908d04d7df65664db28ac4cb00' 
  AND token = '48VMJvH+x7KgDXbyZRXB5jX8TQtBNgA+F8CtoS6v3OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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