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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361f9b2e417ed55a7e6f65166ba5bcb900b93d0ab9571fb51b9bce4827ec9030' 
  AND token = 'tU3OhcXVTN5VvCd/Q8WRUSzpsleq1koX9OAWPfrmOSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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