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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e18bd0c903268397b136f07d0160afb50619d1e49c09ccdf42b3ff9e4581553' 
  AND token = '8GFV3/Zj7dN8UeqfH14B0JSkLqxs0wWPYQPp4aCSep4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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