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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa101793d24fd90c7c7e965425d3fd937eb277c3754318a7e954d12dc23ab1e' 
  AND token = '98FZyBdhFYFXLyjF/fs4JtOKCwSV37KK0TYBc/2vxD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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