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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c160b76e017cbd1c9754c17b6e0facca7655633dde13ae6e062d0d3fb9112da' 
  AND token = 'cj33wpvf2OavqzWOfpTyq/4M5QzsJbBEO16ZTHhWHTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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