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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbb2d4bf3c57d3cb33b0bdabff8554e29d7dad14be6d6cb0b01e4034dad59ad' 
  AND token = 'a3nyX2CElsNGvfeTJv3qofx9CahCe3YTu1eXJTggpEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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