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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85974b75963c01df65b2a7f54f563ec028175df71342ab8ecdd9bd02b1fbf31b' 
  AND token = 'jsMt7Q4QhRTM0OEfEhw7tr2+x/Qqu7cUqD550qrpN/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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