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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7114922bb37983db09c88e5ddf0d07a8f9b01fa5fba2458b5798a99c79b38ec' 
  AND token = '1pKSpa4c+mbk+LZDkAKbYj3urhaqqhJOHNY0tC5BErk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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