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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b5d96455b17a2e9883025130ecec940375f9402db431438073b806209dc322' 
  AND token = 'XPn2uahmItUpPVZuVlPJsi9gGl2IsOf6ySX85k8DOe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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