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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5900a329980c591ee587a040c66bff236e7e68c5c78dac24fe9383620913c096' 
  AND token = 'zNfN0zVh2srYJTt9nzP5gRctpOGTG699H/UHewStJh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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