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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fc12d3511f28383016b7ba326ae962d68fadfa7033a55b9a69fb5760868fc5' 
  AND token = 'eT3Ko6BzmhvJ4G7H5ws8Z90Ra1aQlrn4xMswdynvUi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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