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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506559094cf58ec38fdad6be47e3328437e5cfc5b43ec9cb8fb9e188fbf6d0b6' 
  AND token = 'GH9Lhjm0aVFhYyeAtPLsnLC2pCS4aOzqOlsUQyzy8NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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