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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd57282cd5953647dc1c1413d68fed0c7a62960ad22e3a8d4ddb78b55765f56' 
  AND token = 'QkEj27ggIMqw9wbLkBV4BLtoAgTSpJHuJxSf21ikQbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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