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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd5a99fbdd2729acbe419ef24f97efbd02df3515660b313f11343c0e9d64da1' 
  AND token = 'HUujrG2gu9nXPHuQE+n6r3zf6m0tgl5yGqNWgiPxGyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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