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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73d2a70337ad77388d541eebe6ff9f8ca51721ffab111174880aa0e09a2236b' 
  AND token = 'GmKT+PlpUuFmeGcfKn/sRp9djDxsiFJ6yMQffw9jc70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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