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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4a2f1a6ab7e6693d19e2b01a7a8dc668cfaafc3de0565b0c1c6cf865745e9b' 
  AND token = 'KfZsSiSgFaT21e6xRvsa6KMJdvMdlr5yAsSrNgeefdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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