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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475b13b77e628b35bb5d506586929b4e8e2765b0e83f409ab2c56158c16dbc0f' 
  AND token = 'piwCOKfUSE5X8x4i5aY6NnSkwUINB9C+L3xeilIV4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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