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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575f709e768db01bf54ec5656c9574539aff0dda235b888aeba021da9bcfd56c' 
  AND token = '5Cvt6Mdxl8UFA9wDd+7nvGJMHADlDxb0Mx9SGl4urDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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