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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb38e26244b622518006b3f1326fecaac23202743ef4550a81a5aefd74ca0a4' 
  AND token = '8VxqKeeb+3clMs5BgXqcgHhRRw0j3lOEScT/KFuEoVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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