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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0c851d810d462ffe05f3e3341fce3eb2a65f482d7e039098a180b4ab77fb23' 
  AND token = '1hxV14rFAQTke2hsNSJqzHxWQwI3XSDQDEO/gsAWxFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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