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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd94a1328069ee2f0c60b657ebaffd285c3b21edc88ca50e8b570f904dfc823c' 
  AND token = 'LF/xgnHS73QcANb3u5NBWq3CWdx8z0w9ND89ey/MX5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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