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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dc7421f14fa8f8f1d83ef2c0f2d35e3f2733246ad17b9811dc0c142ce4270e' 
  AND token = 'bPHqMcdt4PZNQcusr59htrues0JUnShOjKhl5aSCab8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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