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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a320dc08e62c96971dfd83c2f9aece00836ab1b56930e7b24e8ff2f92aac75f9' 
  AND token = 'gU8eIyp4ppUR3AFHif7om4ZW0ugKnvlSt8V9PavfiQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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