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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9865ad9f2bb77cde4d4e74585a3c4b9f811b62dbb4fff2ae620e1c4ddfe407d' 
  AND token = 'FzGjKeuVpQBasAWkWulls8usjkr20PJgINNCls9BR/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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