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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4684cfc7e0609d4aeae2bf3f5b865d031db005da1afdee62f4d8f94d582725c' 
  AND token = 'ApytnHqtNCp5K/+DvoneKIhVJJOqWxcTR8vTHM2Vpv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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